Living Things and the Environment
Habitats (p. 705-709)
1. A(n) organism obtains food, water, shelter, and other things it needs
to live, grow, and reproduce from its environment.
2. The place where an organism lives and that provides the things the
organism needs is called its habitat.
3. What needs of an organism are provided by its habitat? food,
water, shelter
4. Circle one: True or False? An area contains only one habitat.
5. List four biotic factors in a prairie dog ecosystem. (answers will vary)
a) grass
c) ferrets
b) hawks
d) badgers
6. The process in which plants and algae make food using water,
sunlight, and carbon dioxide is called photosynthesis.
7. Define species. group of organisms that are physically similar and
can mate with each other and produce offspring that can also mate
and reproduce
8. All the different populations that live together in an area make up
a(n) community.
9. Put the following levels of organization in an ecosystem in order
from the smallest unit of organization to the largest.
community ecosystem
organism population
organism, population, community, and ecosystem
10. In addition to a community of different species, what else does an
ecosystem include? abiotic factors
Studying Populations (p. 711-718)
11. An environmental factor that causes a population to decrease is
called a(n) limiting factor.
12. The largest population that an area can support is called its
carrying capacity.
13. What are some ways weather conditions can limit population
growth? rainfall and temperature
Adapting to the Environment/Competition (p. 723-724)
14. A characteristic that allows a species to live successfully in its
environment. adaptations
15. The way a species makes its living. niche
16. The process in which a species becomes better suited to its
environment. natural selection
17. The three major types of interactions among organisms are
competition, predation, and symbiosis.
18. Circle True or False: The struggle between organisms to survive in a
habitat with limited resources is called natural selection.
19. Circle True or False: In a particular environment, two species can
usually occupy the same niche.
Predation (p. 725-727)
20. An interaction in which one organism kills and eats another is called
predation. The organism that does the killing is the predator. The
organism that is killed is the prey.
21. Circle True or False: If a prey population decreases, the population
of its predator probably will decrease as well.
Symbiosis (p. 728-729)
22. Symbiosis is a close relationship between two speciesthat benefits
at least one of the species.
23. Complete the compare/contrast table.
Types of Symbiotic Relationships
Type of Relationship
Mutualism
Commensalism
Parasitism
How Species Are Affected
relationship in which both species
benefit
One species benefits, the other
species is unharmed.
One species benefits, the other
species is harmed.
25.In a parasitic relationship, the organism that benefits is called a(n)
_parasite, and the organism it lives on or in is called
a(n) host.
Energy Flow in Ecosystems (p. 740-745)
24. Consumers that eat only plants herbivore
25. Consumers that eat both plants and animals omnivore
26. Carnivore that feeds on the bodies of dead organisms scavenger
27. A series of events where one organism eats another and obtains
energy food chain
28. An organism that makes its own food producer
29. Many overlapping food chains food web
30. A diagram that shows the amount of energy that moves from one
feeding level to another in a food web energy pyramid
31. Obtains energy by feeding on other organisms consumer